Stationary water heater



u MH W d h 1m M L n: m lT r A April 1, 1930. A. L.. MITCHELL STATIONARYWATER HEATER Filed June 25,

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Patented Apr. 1, 1930 UNITED STATES PAT ARTHUR L. IVJIITCI-IELL,V OFDALLAS, TEXAS STATIONARY WATER HEI-XTERV Application led June 25,

This invention involves new and useful improvements in stationary waterheaters.

One object of the invention is to provide a tank of lighter materialthan ordinarily used, corrugated so as to maintain the necessarystrength and at the same time reduce the cost of manufacture.

Another object of the invention is to provide a tank that will have agreater heating surface than the stationary heaters now on the market,also one that will maintain a uniform temperature throughout its entirelength.

An important feature of the invention is to provide a tank or boilerrounded at its base so that the heat will have a tendency to followclosely the bottom and sides of the tank, instead of being deflectedtherefrom as is the case with flat bottom heaters.

Still another object of the invention is to provide a means of using thesurplus heat from the burner so that the water can be heated morereadily, thus eliminating a waste of fuel.

Another important feature of the invention is to provide a fire sleevesurrounding the burner and covering the lower portion of the corrugatedtank. This sleeve not only directs the heat and flames into thecorrugated flues of the tank, but protects the outer jacket of theheater from the flames.

A construction designed to carry out the invention will be hereinafterdescribedttogether with other features of the invention.

The invention will be more readily understood from a reading of thefollowing specification and by reference to the accompanying drawings,in which an example of the 1nvention is shown, and wherein:

Fig. 1 is a vertical section of a heater constructed in accordance withthe invention, a portion being shown in elevation, and n Fig. 2 is ahorizontal cross-sectional view taken on the line 22 of Fig. 1.

In the drawings the numeral 1() designates a metal tank corrugated itsentire length closely surrounded by a jacket 11 which great- 1 increasesthe strength of the heater and also fbrms flues 12 from the corrugationsso that the heat from the burner 13 will heat the en- 192s. 'serial No.287,956.

tire surface of the tank as it passes up through the flues (Fig. 2) andout the stack 14.

The lower part of the heater is formed with a re sleeve 15 whichdefiects the fire, and heat from the burner into the flues so that thejacket will not be damaged. rfhe tank 10 is rounded at its base 16 sothat the flames will have a tendency to follow its surface instead ofbeing deflected therefrom.

A faucet 17 connected on a in any suitableplace, prefera ly the bottomof the tank, is used as a drain and the water pipes 19 and 20 servetheir purpose as a cold water intake and a hot water outletrespectively.

Any suitable gas or oil burning system can be used on this heater butthe type shown in the drawings is preferable. A gas service pipe 21 isconnected to a thermostat 22 which controls the lire from the burner 13according to the temperature of the water in the tank. A needle valve 23in a gas line 24:, extending from the thermostat to the burner,regulates the height of the flames.

It is pointed out that the jacket 11 by snugly embracing the tank andcontacting with the longitudinal corrugations reinforces and supportsthe tank, thus providing a simple as well as an efficient construction.

An advantageous structure is had by telescoping the lower end of thetank into the upper end of the sleeve 15 and snugly tting both theseelements into the jacket.

It is obvious that by constructing the tank 10 of comparatively thinmetal and extending the corrugations the full height thereof, anamplified heating surface is had and the water will be much more quicklyheated. The

pipe 18 located Y heat currents must travel under the bottom n of thetank and up through the llues and this gives sufficient time for theabsorption of the heat and is much more efficient than if the currentstravel through a central flue.

Various changes in the size and shape of the different parts, as well asmodifications and alterations, may be made within the scope of theappended claims.

What I claim, is:

1. In a water heater, an upright tank having the body of its verticalwall corrugated'A for its entire length and merged into top and bottomwalls, an open bottom supporting jacket surrounding and closely fittingsaid tank and forming in conjunction with the corrugations thereofVertical heating lues, said jacket extending below the tank to provide aheating chamber communicating with said flues.

2. The combination as defined in claim 1 o With the Wall of the heatingchamber offset to receive a fire sleeve extending above` the bottom ofthe tank.

In testimony whereof I affix my signature.

ARTHUR L. MITCHELL.

